radio/util/fat12.py

   1 #!/usr/bin/env python
   2
   3 from __future__ import division, print_function
   4
   5 curr = 0
   6 idx = 0
   7 byte = 0
   8
   9
  10 def push4bits(val):
  11     global curr, idx, byte
  12     val = val & 0x0f
  13     curr += val << idx
  14     idx += 4
  15     if idx == 8:
  16         print("0x%02X," % curr, end=' ')
  17         idx = 0
  18         curr = 0
  19         byte += 1
  20         if byte % 16 == 0:
  21             print()
  22
  23
  24 cluster = 0
  25
  26
  27 def pushCluster(val):
  28     global cluster
  29     push4bits(val)
  30     push4bits(val >> 4)
  31     push4bits(val >> 8)
  32     cluster += 1
  33
  34
  35 def pushFile(size):
  36     sectors = size // 512
  37     count = sectors // 8
  38     for i in range(count - 1):
  39         pushCluster(cluster + 1)
  40     pushCluster(0xFFF)
  41
  42
  43 def pushDisk(eeprom, flash):
  44     global curr, idx, byte, cluster
  45     curr = idx = byte = cluster = 0
  46     print("Disk with %dk EEPROM and %dk FLASH:" % (eeprom, flash))
  47     pushCluster(0xFF8)
  48     pushCluster(0xFFF)
  49     pushFile(flash * 1024)
  50     if eeprom > 0:
  51         pushFile(eeprom * 1024)
  52     while byte < 512:
  53         push4bits(0)
  54     print()
  55
  56
  57 #pushDisk(32, 512)
  58 pushDisk(32, 512)
  59
  60 pushDisk(0, 2048)